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外语
What is the main idea of the passage? The passage suggests that oxygen remained in the atmosphere because ______.
What is the main idea of the passage? The passage suggests that oxygen remained in the atmosphere because ______.
admin
2005-01-30
104
问题
What is the main idea of the passage?
The passage suggests that oxygen remained in the atmosphere because ______.
选项
A、it was caused by outgassing
B、it was heavier than hydrogen
C、hydrogen became trapped in limestone
D、rays from the sun created equal amounts of hydrogen and oxygen ______.
答案
B
解析
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